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 22-12-00
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747-400
MAINTENANCE MANUAL

 (7)  Go-Around (G/A) Mode
 (a)  
The go-around mode is intended to be used for rotation and climbout following an aborted approach. Go-around mode is initiated by pressing the go-around switches mounted on the No. 2 and No. 3 thrust levers.

 (b)  
The control law for go-around is very similar to F/D takeoff (in-air) mode and is also developed in the Speed section of the pitch channel. The control law is a function of the altitude, flap position, airspeed and vertical speed.

 (c)  
The FIRST IN COMMAND channel priority that was established at multi-channel engage remains in effect through go-around. This priority will determine the channel which will assume control when a cruise mode is selected again. A cruise mode may not be engaged below 400 feet when in go-around mode.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 ELEVATOR AUTOPILOT SERVO - REMOVAL/INSTALLATION
_______________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of an Elevator Autopilot Servo (EAS) from the stabilizer hinge bulkhead. The second task is for the installation of an EAS on the stabilizer hinge bulkhead.
 B.  You can get access to the EASs through access door 315A in the tail cone. There are three EASs on the stabilizer hinge bulkhead. You can find the EASs forward of the top end of the aft torque tube. You can find the left and right EASs on the right side of the torque tube. You can find the center EAS on the left side of the torque tube.
 C.  The task to install an EAS includes an adjustment of the EAS and an operational test of the EAS. This test is to make sure the installation and adjustment of an EAS is correct. The test will also make sure an EAS will operate correctly.
 D.  The procedure to remove and install an EAS is the same for each EAS.
 TASK 22-12-01-004-162
 2.  Remove the EAS (Fig. 401 and Fig. 402)______________
 A.  Special Tools and Equipment
 (1)  G12001-XX - Rig Pin Kit
 B.  Standard Tools and Equipment
 (1)  Bucket
 C.  References
 (1)  
AMM 06-09-05/201, Body Section 48 Access Doors and Panels

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 25-59-01/401, Main Deck Cargo Compartment Lining Panels

 (4)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (5)  
AIPC 22-12-01, Fig. 1

 D.  Access
 (1)  
Location Zones 211 Main Deck Portal to STA 488, LH 212 Main Deck Portal to STA 488, RH 315 Area Aft of Stabilizer Box Compartment, LH 316 Area Aft of Stabilizer Box Compartment, RH

 (2)  
Access Panel
 315A Access Door

 E.  Prepare for the Removal
 S 864-062
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-192

 (2)  
Remove the hydraulic pressure from the correct hydraulic system given below (AMM 29-11-00/201):

 (a)  
Center EAS - hydraulic system No. 1

 (b)  
Right EAS - hydraulic system No. 2

 (c)  
Left EAS - hydraulic system No. 3

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 22-12-01
 ALL  ú ú 05 Page 401 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
LEFT EAS (B7081)
RIGHT EAS SEE B (B7083)
　
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